Antiacne Effects of PVA/ZnO Composite Nanofibers Crosslinked by Citric Acid for Facial Sheet Masks

Figure 1

FE-SEM images of PVA/ZnO nanofibers with different relative concentrations of ZnO NPs: (a) 0%, (b) 1%, (c) 4%, and (d) 7%.

(a)

(b)

(c)

(d)